- The effects of azacitidine on the developing human fetus at the recommended therapeutic dose are unknown. For this reason and because category D agents as well as other therapeutic agents used in this trial are known to be teratogenic, women of childbearing age must have a negative serum pregnancy test (ß-human chorionic gonadotropin) within 72 hours prior to initiating the conditioning regimen and be willing to not become pregnant by using effective contraception while undergoing treatment and for at least 3 months after the last dose of azacitidine.